Since the mappings can be subject to change and according to
the elasticsearch docs
you can not change the mapping of a field, only add or remove (multi-)fields, I decided to write a tool that helps me migrate (reindex) my
data.
Basis for the workflow in this tool is a method from the elasticsearch blog from 2013.
Basically instead of calling your index my-index this script will call your index my-index_v0 with a new version each time you migrate and maintain an
alias for the latest version called my-index.
I know this tool is propably not helpful for people with massive indices since it copies all data. It would be possible to delete the old version, but just adding new multi fields with new mappings is a better choice. The script helped me a lot though in the prototyping phase of projects to not have too many multi fields.
Usage: migriere-es [options]
Options:
-h, --help output usage information
-V, --version output the version number
-i, --index <index> The index name.
-m, --mappings <mappings> A json file with mappings.
-n, --new Create new index without reindexing.
-u, --url [url] An url to a elasticsearch node. Defaults to `localhost:9200`.
-l, --log-level [loglevel] The log level. Defaults to `error`. Set this option to`debug` to see the queries this script performs.
npm install -g migriere-es (Requires node with async/await support)